v/vlib/time/time_test.c.v

import time

fn test_tm_gmtoff() {
	$if windows {
		return
	} $else {
		rawtime := i64(0) // C.time_t{}

		C.time(&rawtime) // C.tm{}

		info := C.localtime(&rawtime)
		t1 := time.now()
		t2 := time.utc()
		dump(t1)
		dump(t2)
		dump(t1.nanosecond)
		dump(t2.nanosecond)
		diff := int(t1.local_unix() - t2.unix())
		dump(diff)
		dump(info.tm_gmtoff)
		assert diff in [info.tm_gmtoff - 1, info.tm_gmtoff, info.tm_gmtoff + 1]
	}
}